once you get to step 3 in the editor "define the activities",
highlight the activity you want to add "more" to,
then hit "edit activity",
then hit "edit activity buttons",

this will then open a window with an image of the hard buttons etc on it and a window called Screen functions, just hit add function, you can then add a label for something and then you can give it a function wether its a IR code or a jump to somewhere, favouties list for example.
you can have the macro for your activites jump to this screen, or just hit the "more" hard button.